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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity vs accuracy in long range shooting
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<blockquote data-quote="Bart B" data-source="post: 679484" data-attributes="member: 5302"><p>Most cartridges shoot most accurate at all ranges with reasonable muzzle velocities; not the highest attainable with some slow powders. And some loads producing the lowest spread in muzzle velocity and peak pressure are horrible in the accuracy department.</p><p></p><p>I've suggested that one decide what the furthest they want to miss their point of aim at a given range, then find the rifle and ammo that they can shoot groups twice that size. If you max miss from point of aim at 800 yards is 5 inches, then use something you can shoot no worse than 10 inch groups at 800 yards.</p><p></p><p>Extruded powder's been the favorite of long range competitors; ball powder's never been popular with the winners and record setters. Milder primers often produce better accuracy than the hot ones. And use bullets a few ten thousandths inch larger than your barrel's groove diameter.</p><p></p><p>Shoot enough shots per group so that the groups are meaningful; one 20-shot group's about 10 times more meaningful than five 4-shot ones, four 5-shot ones or even seven 3-shot ones. Ignore the smallest groups shot; they happen the least often and folks typically wear out their barrels trying to shoot another tiny one they did months earlier. Accuracy you can count on all the time with a given load's best represented by the largest group shot with it.</p><p></p><p>A favorite load for 24 inch 1:12 twist .308 Win. barrels at long range was 44 grains of IMR4320 under a Sierra 190-gr. HPMK match bullet. If your barrel's groove diameter is .3080" or smaller, it'll probably do well with this load. This assumes the barreled action is properly epoxy bedded and the stock screws are torqued to about 45 inch-pounds. And the barrel's got a good quality bore.</p><p></p><p>Other successful loads at long range for the .308 round with a 1:12 twist barrel....43 grains of IMR4064 under a 175 or 180 grain match bullet.</p></blockquote><p></p>
[QUOTE="Bart B, post: 679484, member: 5302"] Most cartridges shoot most accurate at all ranges with reasonable muzzle velocities; not the highest attainable with some slow powders. And some loads producing the lowest spread in muzzle velocity and peak pressure are horrible in the accuracy department. I've suggested that one decide what the furthest they want to miss their point of aim at a given range, then find the rifle and ammo that they can shoot groups twice that size. If you max miss from point of aim at 800 yards is 5 inches, then use something you can shoot no worse than 10 inch groups at 800 yards. Extruded powder's been the favorite of long range competitors; ball powder's never been popular with the winners and record setters. Milder primers often produce better accuracy than the hot ones. And use bullets a few ten thousandths inch larger than your barrel's groove diameter. Shoot enough shots per group so that the groups are meaningful; one 20-shot group's about 10 times more meaningful than five 4-shot ones, four 5-shot ones or even seven 3-shot ones. Ignore the smallest groups shot; they happen the least often and folks typically wear out their barrels trying to shoot another tiny one they did months earlier. Accuracy you can count on all the time with a given load's best represented by the largest group shot with it. A favorite load for 24 inch 1:12 twist .308 Win. barrels at long range was 44 grains of IMR4320 under a Sierra 190-gr. HPMK match bullet. If your barrel's groove diameter is .3080" or smaller, it'll probably do well with this load. This assumes the barreled action is properly epoxy bedded and the stock screws are torqued to about 45 inch-pounds. And the barrel's got a good quality bore. Other successful loads at long range for the .308 round with a 1:12 twist barrel....43 grains of IMR4064 under a 175 or 180 grain match bullet. [/QUOTE]
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velocity vs accuracy in long range shooting
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